KR19980047437A - Search channel broadcast signal display method and display device of video receiver - Google Patents

Abstract

PIP screen displays the television broadcast signal of auto searched channel so that user can easily check and select the channel of desired program. It has a mother screen tuner unit and a PIP screen tuner unit. In this case, the mother screen tuner unit sequentially receives the television broadcast signals of each channel one by one, detects the synchronization signal from the signal received by the mother screen tuner unit, and determines whether there is a television broadcast signal, and the channel on which the synchronization signal is detected. When the automatic search is completed, the video display screen is divided into a plurality of channels, and among the auto-discovered channels, the parent screen tuner unit receives a television broadcast signal of one channel to display one of the divided areas of the video display screen. In addition to displaying a video on the PIP screen tuner unit, the parent screen tuner unit A plurality of areas in which the television broadcast signals of channels other than the receiving channel are sequentially received at predetermined time intervals, and each television broadcast signal stored in the memory is stored in the memory while the received television broadcast signals are stored in the memory; By displaying a still image on the screen, the user can confirm the television broadcast signal of each channel and immediately select the channel of the television broadcast signal that he / she wants to watch.

Description

Search channel broadcast signal display method and display device of video receiver

The present invention relates to a search channel broadcast signal display method and display apparatus of a video receiver for displaying a television broadcast signal of an automatically searched channel as a picture in picture (PIP) screen on a video display screen.

In general, a television broadcast signal is divided into a plurality of channels having a predetermined bandwidth and broadcasted.

For example, the National Television System Committee (NTSC) -M scheme, adopted in many countries around the world, including Korea, the United States, and Japan, has a Very High Frequency (VHF) frequency band of 5488 MHz and 174216 MHz and Ultra High Frequency (UHF) of 470890 MHz. The frequency bands are allocated to the bandwidths of 6 MHz, respectively, and are set from channel 2 to channel 83, and the broadcasting station broadcasts a television broadcast signal in the frequency band of the set channel.

Video receivers such as a television receiver and a video cassette tape recorder that receive such a television broadcast signal presently have a television broadcast signal of an adjacent channel when the field strength of the television broadcast signal of a channel adjacent to the channel receiving the television broadcast signal is strong. It affects the television broadcast signal of the receiving channel.

Therefore, when allocating a channel of a television broadcast, the television broadcast signal is not broadcast to an adjacent channel so that the currently received television broadcast signal is not affected by the signal of the adjacent channel.

That is, when a television broadcast signal is transmitted through a specific channel, a channel is allocated such that a channel higher than one channel and one channel lower than the channel is not transmitted.

When two adjacent broadcast stations transmit a television broadcast signal through the same channel, interference between the two transmitted television broadcast signals occurs and cannot be received.

Therefore, when two broadcasting stations are adjacent to each other, even the same television broadcast signal is broadcasted on different channels, which causes channels for receiving television broadcast signals to be different in each region.

When the user of the video receiver selects each of these television broadcast channels one by one to check whether there is a television broadcast signal, it causes a lot of inconvenience and inconvenience to the user.

Therefore, the video receiver has an automatic search function, and automatically searches for and stores a channel with a television broadcast signal when the user selects the automatic search function. The channel is raised and lowered in the range of to receive the television broadcast signal.

However, as described above, when the user selects a channel of a television broadcast signal that the user wants to watch from among the television broadcast signals of the automatically detected and stored channel, it has to be checked by pressing the channel up key and the channel down key one by one. There was a problem giving.

Accordingly, an object of the present invention is to display a search channel broadcast signal of a video receiver which enables a user to simply select a desired channel of a television broadcast signal by displaying a television broadcast signal of a searched channel as a PIP screen when the automatic search function is completed. The present invention provides a method and a display device.

According to a method and a display apparatus for displaying a broadcast channel broadcast signal of an image receiver according to the present invention, a mother screen tuner unit for receiving a television broadcast signal to be displayed on a mother screen and a television broadcast signal to be displayed on a PIP screen are provided. PIP screen tuner unit for receiving the.

When the user selects the automatic search function, the mother screen tuner unit sequentially receives the television broadcast signals of each channel one by one, and detects a synchronization signal from the signals received by the mother screen tuner unit to determine whether there is a television broadcast signal. And stores the channel where the synchronization signal is detected.

When the automatic search is completed, the video display screen is divided into a plurality of channels, and the mother screen tuner unit receives a television broadcast signal of one channel among the auto-discovered channels and displays it as a video in one of the divided areas of the video display screen. do.

The PIP screen tuner unit sequentially receives television broadcast signals of channels other than the channel received by the parent screen tuner at predetermined time intervals, stores the received television broadcast signals in a memory, and stores each of the television broadcasts stored in the memory. The signal is displayed as a still image on a plurality of divided regions of the video display screen.

Therefore, according to the present invention, the user can confirm the television broadcast signal of each channel and can immediately select the channel of the television broadcast signal that he / she wants to watch.

1 is a circuit diagram showing a configuration of a display device of the present invention.

2 is a signal flow diagram showing a display method of the present invention;

3 is a view showing an embodiment of displaying a television broadcast signal of a search channel on a video display screen according to the display method of the present invention.

4 is a view showing another embodiment in which a television broadcast signal of a search channel is displayed on an image display screen according to the display method of the present invention.

Explanation of symbols on the main parts of the drawings

1: microcomputer

2: operation command input unit

3: antenna

4: LNA

5: mother screen receiving unit

6: Image signal processor

7: Sync signal detector

8: Screen receiving unit for PIP

9: demodulation unit

10: decoder

11: memory

12: PIP Controller

Hereinafter, a method and a display apparatus for displaying a search channel broadcast signal of an image receiver according to the present invention will be described in detail.

1 is a circuit diagram showing the configuration of a display device of the present invention. As shown therein, the microcomputer 1 controls the automatic search of the channel with the television broadcast signal and the display of the television broadcast signal of the searched channel, and the microcomputer 1 sends an operation command according to a user's operation. A low noise amplifier (LNA) 4 for low noise amplification of the received signal of the antenna 3, and an output signal of the LNA 4 A mother screen receiver 5 for receiving a television broadcast signal of a channel under control, an image signal processor 6 for processing and outputting an output signal from the mother screen receiver 5, and the video signal processor 6 A synchronization signal detection unit 7 which detects the presence or absence of a synchronization signal from the output CVBS (Component Video Blanking Signal) and inputs it to the microcomputer 1, and an output signal of the LNA 4 of the microcomputer 1 Under control A PIP screen receiver 8 for receiving a television broadcast signal of a channel; a demodulator 9 for demodulating CVBS from an output signal of the PIP screen receiver 8; and an output signal of the demodulator 9; A decoder 10 which decodes an external CVBS input through an external audio / video terminal and outputs a luminance signal Y and a chroma signal U and V, and outputs an output signal of the decoder 10 to a memory 11. ) And a PIP controller 12 which inserts and outputs the luminance signal Y and the chroma signal U and V output to the PIP screen.

In the search channel broadcast signal display apparatus of the video receiver of the present invention configured as described above, the operation command input unit 2 outputs an operation command according to a user operating a function key provided in the video receiver or a function key of a remote control transmitter. Is input to the microcomputer 1.

The microcomputer 1 determines an operation command input from the operation command input unit 2 and performs an operation accordingly.

Here, when the input operation command is an execution command of the automatic search function, the microcomputer 1 controls the mother screen receiving unit 5 to sequentially receive the television broadcast signal of each channel.

Then, the mother screen receiver 5 sequentially receives and outputs the television broadcast signals of the respective channels among the television broadcast signals inputted to the LNA 4 through the antenna 3 and then amplified with low noise.

The television broadcast signal received by the mother screen receiver 5 is processed by the video signal processor 6, and then the video signal is output and displayed on the video display screen.

In the CVBS output from the video signal processor 6, the synchronization signal detector 7 detects the presence or absence of a synchronization signal, and inputs the detection signal to the microcomputer 1.

Then, the microcomputer 1 judges the presence or absence of the television broadcast signal as the output signal of the synchronization signal detection unit 7, and stores the channel containing the television broadcast signal as a result of the determination.

In this state, when the auto search function is completed, that is, the television broadcast signal is received to the last channel, the presence or absence of the synchronization signal is determined, and the storage of the channel with the synchronization signal is completed, the microcomputer 1 receives the mother screen receiving unit 5. Control to receive the television broadcast signal of the first channel automatically detected.

The television broadcast signal of the first channel received by the mother screen receiver 5 is output through the video signal processor 6 and displayed on the video display screen.

The microcomputer 1 controls the PIP screen tuner 8 so as to sequentially receive the TV broadcast signal of the second channel automatically searched at predetermined time intervals.

The television broadcast signal received by the PIP screen tuner 8 is inputted to the demodulator 9 to demodulate the CVBS, and the decoder 10 decodes the luminance signal Y and the chroma signal U and V from the decoder 10. After that is input to the PIP controller 12.

The PIP controller 12 divides the area of the video display screen into a plurality of areas under the control of the microcomputer 1, and the luminance signal Y and the chroma signal U of the television broadcast signal output from the decoder 10. (V) is stored in the memory 11, and the luminance signal Y and the chromaticity signal U of the video signal processing unit 6 according to the area of the video display screen on which the television broadcast signal stored in the memory 11 is to be displayed. Insert into (V) and output.

2 is a signal flow diagram illustrating a display method of the present invention. As shown therein, when there is a command of automatic search in step S1, the automatic search is performed in step S2, it is determined whether the automatic search is completed in step S3, and in step S3 If the automatic search is not completed, step S2 is repeated to continue searching for a channel with a television broadcast signal.

When the automatic search is completed in the step S3, under the control of the microcomputer 1, the PIP controller 12 divides the image display screen into a plurality of areas to be displayed as a PIP screen.

For example, it is partitioned into 13 regions PR1PR13 as shown in FIG. 3 or 16 regions PR1PR16 as shown in FIG.

In the next step (S5) stores a '1' in the channel variable (CH) to receive, '1' is stored in the area variable (PR) of the video display screen in step (S6) and then in step S7 After receiving unit 5 receives the channel broadcast signal according to the value of the channel variable CH, that is, the first channel television broadcast signal, in step S8 the area according to the value of the area variable PR, that is, the first area ( The video is displayed on the PR1).

In the next step S9, '1' is added to the value of the channel variable CH, and in step S10, '1' is added to the value of the area variable PR of the image display screen in step S11. The PIP screen receiving unit 8 receives the television broadcast signal of the channel according to the value of the channel variable CH, that is, receives the television broadcast signal of the second channel, and then stores the television broadcast signal received in step S12. Store in (11).

In the next step S13, the stored television broadcast signal is inserted into the area according to the value of the area variable PR, ie, the second area PR2, on the television broadcast signal received by the mother screen receiving unit 5 as a PIP. To be.

In the next step S14, it is determined whether or not the last channel has been auto-discovered, and if it is not the last channel, the value of the channel variable CH and the number of partitioned areas are compared in the step S15.

If the value of the channel variable CH and the number of partitioned areas are not the same in step S15, the TV broadcast signal of the channel automatically searched by repeating from step S9 is sequentially received, and the memory 11 ) Is displayed as a still image in the area PR2PR13 or the area PR2PR16 of the video display screen.

That is, when the area of the video display screen is divided into 13 as shown in FIG. 3, the television broadcast signal received by the PIP screen receiver 8 and stored in the memory 11 is the area of the video display screen (PR2PR13). In the case where the video display screen is divided into 16 as shown in FIG. 4, the TV broadcast signal received by the PIP screen receiver 8 and stored in the memory 11 is sequentially displayed on the video display screen. Displayed in the area PR2PR16 sequentially.

If the value of the channel variable CH is equal to the number of partitioned areas in step S15, the value of the area variable PR is set to '0' in step S16 and then repeated from step S7. In the area PR1, the TV broadcast signal received by the mother screen receiving unit 5 is displayed as a moving image, and the PIP screen receiving unit 8 receives the area PR2PR13 or the area PR2PR16 in the memory 11 to display the moving picture. Stored television broadcast signals are displayed sequentially.

In this state, if it is the last channel searched automatically in the step S14, the TV broadcast signal of the channel searched automatically is repeatedly displayed from the step S5.

As described above, according to the present invention, when a channel having a television broadcast signal is automatically stored and received, the television broadcast signal of each channel is received and displayed on the video display screen, so that the user can display the television of each channel displayed on the video display screen. The broadcast signal can be checked and the channel of the television broadcast signal desired to be viewed can be selected immediately.

Claims (3)

According to an automatic search command, a first process of storing a channel with a television broadcast signal while sequentially receiving television broadcast signals of all channels, and partitioning an area of an image display screen when automatic search is completed in the first process. A second process of receiving a television broadcast signal of one channel automatically detected by the mother screen receiving unit and displaying the video on the first area of the image display screen; and a television broadcast signal of a channel received by the mother screen receiving unit in the second process. In addition, the system automatically receives and stores television broadcast signals of other channels, which are automatically detected, and inserts the PIP into the television broadcast signals of the channels received by the mother screen receiver to display still images sequentially from the second area of the video display screen. When the display is completed up to the last region in step 3 and in the third step, The TV broadcast signal of the channel is received by the parent screen receiving unit and displayed as a video on the first area, and the TV broadcast signal of the next channel of the channel received by the mother screen receiving unit is sequentially received, stored, and inserted into the PIP to display the video display screen. And a fourth process of repeating the display sequentially from the first region, and a fifth process of repeatedly performing the second process when the last channel is automatically searched in the third process. Channel broadcasting signal display method. The method of claim 1, wherein the first process determines whether or not a television broadcast signal exists based on the presence of a synchronization signal. A microcomputer for controlling the automatic search of a channel having a television broadcast signal and controlling the display of a television broadcast signal of the searched channel, an operation command input unit for inputting an operation command according to a user's operation to the microcomputer, and reception of an antenna An LNA for low noise amplifying a signal, a mother screen receiving unit for receiving a television broadcast signal of a channel under the control of the microcomputer from the output signal of the LNA, and an image signal processing unit for processing and outputting an output signal of the mother screen receiving unit. In the equipped video receiver, A sync signal detector for detecting the presence or absence of a sync signal from the CVBS output from the video signal processor and inputting the microcomputer to the microcomputer; and a PIP for receiving a television broadcast signal of a channel under control of the microcomputer from an output signal of the LNA; A demodulator for demodulating the CVBS from an output signal of the PIP screen receiver; a decoder for decoding the output signal of the demodulator or an external CVBS and outputting luminance and chroma signals; And a PIP controller configured to insert and output the luminance signal and the chromaticity signal output from the image signal processor as a PIP screen.